A relatively large voltage range. Increasing the drive worked on the first try.

When the need for constant output voltage for a wide variety of input values??, the product seemed ideal. Very simple to set up with great sensitivity. Easy wiring. With a bit of caution must operate on the first circuit.

It's well built, nice soldering job, no short circuits. I tried to build it first, but this one is far better than the one I built. I use it to run 12V cooler in a cooling pad on the 5V ports on my laptop. I'll order a few more for my other projects. It even has one small red LED to indicate when there is power on input and if the voltage is too low the LED won't work. That makes it easier to operate!

It's cheap and not worth building the simple circuit. I really like it :)

WEll constructed with no signs of shipment damage. Came in EMF protected sleeve. Good fine grain control of voltage adjustment allowing .1V with good accuracy. 12.2V input gave a maximum of 37.8V output at maximum adj. 10.8V output at minimum adjustment (that's the brass screw on the blue box) Not carried out current load test yet. Probably very useful for boosting LED/ charge circuits requiring more than 12V

Somewhat surprised this did not give lower voltage than 10.8 on minimum output (12.2V in) However I wanted a boost V output so this module was perfect

As boost output this board is excellent. Good fine grain voltage control for V-out setting. Slightly too expensive compared with the other board http://www.dx.com/p/mini-dc-dc-voltage-stabilizer-regulator-module-red-126106 which is NOT a boost voltage, but reduces well to 1.V

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